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CPLL Datasheet(PDF) 22 Page - Exar Corporation |
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CPLL Datasheet(HTML) 22 Page - Exar Corporation |
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22 / 29 page  X XR RP P7 77 72 24 4 Q Qu ua ad d C Ch ha an nn ne ell D Diig giitta all P PW WM M/ /P PF FM M P Prro og grra am mm ma ab blle e P Po ow we err M Ma an na ag ge em me en ntt S Sy ys stte em m © 2012 Exar Corporation 22/29 Rev. 1.0.1 SUPPLY_FAULT_EVENT interrupt generated by the controller. The host then can use anI2C command to check which channel is at fault. In addition, OVP fault can be monitored through GPIO0. A user can choose one of three options on how to react to an OVP event: to shutdown the faulting channel, to shut down faulting channel and to perform auto-restart of the channel, or to restart the chip. In the case of shutting down the faulting channel and auto-restarting, the user has an option to specify startup timeout (the time in which the fault is validated) and hiccup timeout (the period after which the controller will try to restart the channel) periods in 1 msec increments with a maximum value of 255 msec. Note: a channel will share a response to an OVP or OCP event. OCP A user defined OCP fault level is set with 1mA increments in PA5. PA5 uses calculations to give the user the approximate DC output current entered in the current limit field. However the actual current limit trip value programmed into the part is limited to 280mV as defined in the electrical characteristics. The maximum value the user can program is limited by Rdson of the synchronous Power FET and current monitoring ADC range. For example, using a synchronous FET with Rdson of 30mΩ, using the wider ADC range, the maximum current limit programmed would be: The current is sampled approximately 30ns before the low side MOSFET turns off, so the actual measured DC output current in this example would be 9.33A plus approximately half the inductor ripple. An OCP Fault is considered to have occurred only if the fault threshold has been tripped in 4 consecutive switching cycles. When the switching frequency is using the 4x multiplier, the current is sampled only every other cycle. As a result it can take as many as 8 switching cycles for an over current event to be detected. When operating in 4x mode inductors with a soft saturation characteristic are recommended. When the OCP level is reached and the fault is generated, the host will be notified by the SUPPLY_FAULT_EVENT interrupt generated by the controller. The host then can use an I2C command to check which channel is at fault. In addition, OCP fault can be monitored through HW Flags on GPIO0. The host can also monitor OCP warning flag through HW Flags on GPIO0. The OCP warning level is calculated by PowerArchitect™ as 85% of the OCP fault level. A user can choose one of three options on how to react to an OCP event: to shutdown the faulting channel, to shut down faulting channel and to perform auto-restart of the channel, or to restart the chip. The output current reported by the XRP7724 is processed through a 7 sample median filter in order to reduce noise. The OCP limit is compared against unfiltered ADC output. |
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